*The item is in working condition, but the operating time has not been measured.
■ Condition of Scratches and Dirt
Crystal: Minor (thin scratches on glass)
Case back: Minor
Bezel: Minor
Strap: New aftermarket part
Calendar: Quick-set function is operational
Grand Seiko 5645-7010 History
1. Background of its Birth
Release Period: Approximately 1970 - 1974
The 56 caliber series was developed as a high-beat model emphasizing thinness and practicality, following the 61GS, which debuted in 1968 with a high-beat 10 vibrations (36,000 vibrations/hour).
The 5645 is an automatic, high-beat caliber with a date function, and the 5646 with a day-date function also exists concurrently.
2. Features of Caliber 5645
Automatic winding, 36,000 vibrations per hour (10 vibrations/second)
Manual winding mechanism included
Second hand stop function (hacking function) included
Date quick-set mechanism included
Thin design, with a slimmer case thickness compared to the earlier 61GS
3. Design of the 5645-7010
The case is made of stainless steel, with relatively simple and straight lug shapes.
The dial is often silver-toned, featuring the typical GS style with bar indices and dolphin hands.
The crystal is a domed hardened glass, a common choice at the time.
The case back exists in two variations: an early type with a gold "Lion Medallion," and a later type with a flat surface and no medallion.
4. Position within the Series
The 56GS series was planned as a "GS that combines mass production and practicality," in contrast to the high-end route of the 61GS.
At the time, it was a relatively affordable model within the Grand Seiko lineup and was widely popular in Japan.
Consequently, a relatively large number of original units remain today.
5. Discontinuation and Significance
The 56GS was manufactured until around 1975, after which Grand Seiko itself entered a period of temporary suspension.
The "5645-7010" is a significant model positioned as one of the "last mechanical Grand Seikos" in GS history.
After this, Grand Seiko transitioned into the era of **quartz (95GS series)**.
Summary
The Grand Seiko 5645-7010 is a representative model of the "56GS" series that appeared in the early 1970s, characterized by:
High-beat 36,000 vibrations
Thin and highly practical design
A model that marks the end of early mechanical Grand Seikos
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